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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '322d891a1f83bee4358f191a99a9a8d9beb792cfccbf3a7c1dfeba53a99dace0' 
  AND token = 'f0Veoq3KIzmcJahEcGMUhFSbZ9ph9p6JCUJO8MO/abw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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