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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79de61dcdea2cfc589553da45dcac3b9ec4635c58dcd72fa121b8fc3f12c64b1' 
  AND token = 'Xp7juOD25LTqkLhsUh+7X3mnwm4hdXX0QtiqSgp0Xyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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