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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5be38022979d9a135c83d727afa48ff3e1c8d118535b52ea9d20da44507bb08' 
  AND token = '0wYXwNo4TzYWPF2rLEdt2QALZPYSXnXAnH3K01jFhII=' 
  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"
    }
  }
}