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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fe16a33a9c1899f777d39e02f4c3a539743f392d5058a8ddcba09e40e1ad525' 
  AND token = 'L20QYgwi83UlagSLEcx0pemnZVxMwVSikQOehlAAFvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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