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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d574f14500f3c89650b0752402684218d1cf834491cd8816afcce4c9836d235' 
  AND token = 'f/Hes6S/lfzaj21qbjIZ+E0BvwIHC/yYKk8fC0xv9D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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