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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4377ae3f7cf5c6b4e6b2b6a74786417b022abd13c4067488477910a2c39c183d' 
  AND token = 'YWpEOE7Q3tilDb+3zWdNMSxTd3LwKupotgNDAhDu4YA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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