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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4339c675f35ed7f2a2e0b0bf2e719b1d34ad9a93f7cc0ef2f6c40a84d5e565c3' 
  AND token = 'HIL0O2k9DEsmJ/5MlxQW5LQXncH9v7cW0eW3p4Itrz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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