Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2edae245fcf053f214cf7e09ed5426e3e627aea96247f03424a252d9c6f642b5' 
  AND token = 'Nz1O18Lt/IBqUBWn1DTnAIvN0W6ADST2U8RHmz/UnAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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