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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5c026dcedf71bd9c30f9c84ad9038c7e9c6ea919c8031a478d053710a6181d9' 
  AND token = 'ndeoUsQ4TVIc9Ap9yJy/4VnTF6HGrkYnEXpu1zju2JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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