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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37ad611314ae9627947394549dbd928605e0745d846e5a35f5de8d41c6c1a86d' 
  AND token = '3FTbUw6+80R2ilmqDpdRgVlIU151j5Z4cA1TqKoY+rQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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