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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c9ea99b5805bf0155665686c846690b5ff797ccbffeb8578dba77742af828f9' 
  AND token = 'BtjjuBCFJ1rROLuOOsP4LjLvLwOoYxOoB2WDuzkBjSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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