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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9555121ce40a00d54881702c54b8a89a5dc8790960934c59d311355a1d1a3993' 
  AND token = 'm/RkEzZAObVNU93zK+bZIVkL/wMlsJgc0XRrjR0VHZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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