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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4236f1b328455acb817ad132d0bbf5a0df3b45d99cc25344466bba71d4e533b4' 
  AND token = 'vM7QCQ2hbbg/2TgRpHC+jJSaf6bUcLHjtXxFi01OpPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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