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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf55928aa0318deac60ff91fb54966f6b8d9a413a20315b4757e2a7675b3f7dd' 
  AND token = 'F9r0mQDTcXJumGZXAEvedV9u9Gr7BjXNrJ2K6yXaB+A=' 
  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"
    }
  }
}