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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a345f14cc6515de36eca89a2a86c73418045cfc572e68bf4f87db33813d15ea4' 
  AND token = 'xhdnxKWHqRQvVI1gPmkkXDiFIEgQi75bEB3tkF/T8UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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