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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c3054a35b6bfde92d168f2dc26109991ebde886f5736627fe4c479f97c2488d' 
  AND token = 'McpM1ScwnzlUAJS7FeiLgzzde1dUy5AQr9zzZ1H96yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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