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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13f7d316a36c93b6faafb7cbcf5aba1de30e685e632a6124a81e7dd428fc8901' 
  AND token = '2cv/2FwPaueCNSLUCT+csMJ/WEM4rwfKO6R9VE43PZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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