SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dc7ee7557f3cd80f6c3f8ac3053b012ee90bc4583a5b04e830a7c69d62ade61' 
  AND token = 'DPGO+3jXXYPhrCeTGg8zaR8S/Rp9/Um9CJMtdUY2+qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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