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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96370042a194a01770e1ccfe1df5182b5eaa36d68cda8d5ad2c0df70050b1034' 
  AND token = '3iX8qYSVApi2LuI1zqotJArG5Ph4m75yPrrnObs8f/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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