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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ba063f242fe29a35149a45b6ae78af34ade4a5a285bf69484848555580c9dfb' 
  AND token = 'iuQUVjhFh4o+Lf8F5SdHHuT+pvM9myG7cZCPpM0dwcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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