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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09322eb8050f9f374cbdb24120d772977a0d0449181b9903d5641ba3cdc6a8bb' 
  AND token = 'aWjiTfAR0UY5ps3fyTVCchrb9lmgrT+hMoNr/m3F2tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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