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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6663b565e2c3f4fda0785510ee30db6ce98826ca12613d14e17e21c817ae13ff' 
  AND token = 'CNYUiLhLyv2jIjpNI+BcCaqkIzsj10f1cL+WidXX0YY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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