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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdee76a671ed9db273c3ec58a7621bc5ffd26aefefb2a1ba5b03e17729771b65' 
  AND token = 'K3cx86jlwg19Ra7eucH/IhboXH+hIwfx7uZVg+KgS2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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