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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '573a268354af97dba9393e2b713b3951b566c44d9755bf5c4afbe588b6990e09' 
  AND token = 'ugOAm53RHhMO0ghxA45plJcESzVfZucvs0D6gdyYtCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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