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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '355b7dae363f96047aebcb5422059687e9cc757a4b8357505aca339e0a0f2a49' 
  AND token = 'ncYiuHb2W9eX8AYuDSO+FPiH3QCvpkcHJ+vej099D3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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