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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd02d541428ae93c7c78daffcc9d421b7af96810ba9f5d81245074b57cf4b00f' 
  AND token = 'HdOQpctw6dBaVKRZzN8dWZKIfxOXLV0ASDZh0faftLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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