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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6029eec9d3867f76195a612f01c66800d070adeab1570f1cf26f71233cea4e3a' 
  AND token = 'QR/Kq6kJSEA9wzRe6J0V3Ze4UQdtf7ofCxosi5wKiRQ=' 
  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"
    }
  }
}