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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '113b584d2cef67575b8af2ab4281562a76407a7a8389b9644703630b453438c4' 
  AND token = 'MQgwHH2pck6drbqKQbVVo9ZwNzXhlErEP/3jM4Ab8A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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