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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9b6eba82610cb3fceabb4e114626d9e052048c08424d0d7555c110ec2cfd458' 
  AND token = '8g7gQdm3B/C2xW4a8++znxVaj23YXCwPQTUWOosHhDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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