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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6d5bb03278b38c468bdefda179e6cdb0271dda9ba327dd67830e3115531192a' 
  AND token = 'u2olBvpUNLjUglLRepRQc9Kz5wAgD4Uvab4K7VpxR8Y=' 
  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"
    }
  }
}