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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6accbd514e21010305ec919028793ede4cf5b8eb4f5ee5f5d9f41eca948132c5' 
  AND token = 'GtoUl6/OWJXOaSGnQLlCgVuFjZgJ3L5fjUA9TDHJ72Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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