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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faec0fc6ec4ff3bac45d9581b9094e38d38d6955978c809f5640b4dc80fc1402' 
  AND token = '36/6yFX3RB/0fos8FD3YChOwxceyt9braZdowXstMIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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