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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bef33106fd5219bed0193d8d0b5b86a6c7ba1c118b299e3ae8f7279efb76b0f' 
  AND token = 'DFBDbwr8jafMgU6lwUgNWSQN7XVnCGSREg3N/sKkXuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}