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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb0c0ff8f030946edaa50eca85037e02aeb83816c06d895b72c51462ccecc84c' 
  AND token = 'uAzwg7qp6Oiq3ZzWy1AYbrRqxixlRg9YqN34Gxm10IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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