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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '849737d4fc6837a3391fe0bc114530edc7ff70ae90c96d76ca80589934facd94' 
  AND token = '2DdN9xy1RsrkDOBf9FlOOz++JUDioAFukbmbK0bM6WQ=' 
  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"
    }
  }
}