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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8fdb606cce5a212d9d50404d21d581acf5731af5c13732336b49d94726882cf' 
  AND token = 'EQW/hgT9DxzR9FmpHTEwnOrB2mB3CcFIa40EVZAhpmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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