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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa109361ece9745b2c316f1f611965ad2e45be4a8a444d9ae8622cdae0a14e03' 
  AND token = '0nkWxeq7WHHdYEjC9VAQX/LHOjAeF7rMn4jCXSunXTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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