SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2153a60b08bdb1dafb7ce4edc3d33e29bfbcef4a7fbbdd0523b919518d469d62' 
  AND token = 'uiGZ93VqvRMYXzwlTRpErzK1mssGywmNAB4Pp9F7dmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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