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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '183dda1f9d2c98722898c003ae4d09aa3f1e73ac73ddf41f7cf7d84f09f68b30' 
  AND token = 'CzYoQsgzOY/kqCszGNuQeUjclokx5JkwrBSWmlH1t9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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