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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ae55bfece2adb1cf565b6e96d5d0cd50a58d155b3a7a1de6747d5de99cd5f88' 
  AND token = 'Tq1x/9THZleD0XGrM3p4ExrlMPUnZa9J7Icb4ISxEm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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