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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c5bd9a67c97d7dcfab3e8c4261be1bd598793b00372bfb8093cd7b309bfa29c' 
  AND token = 'lZezXAYsyPD7kYnoZYLdhKS8rsr9i+cKIWcejM5QyxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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