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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfeed8953dfddaa1256f4d240216ba3f755cb0b659decaac53539f0253718026' 
  AND token = 'lYM286IgB/wsa2THf7IesUXDjFX1A13sV/pAWAdzx1w=' 
  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"
    }
  }
}