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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90e9c1cf82fb8ef1ef1f3531c487dc6e3883d0bf497c5f42d6d10cf6ee37a291' 
  AND token = 'Aikhry96O6JHfUhdX+f1OqtmD7P/knmDDtg6z9WUjpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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