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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0236a20b304bd713821e35813fd969a0f5147c6b9ad31777656e00e314b2812b' 
  AND token = 'QlBH2JqAIs08bZ79mDhPgJ/lLIM8UlwDcZk7L2X4S5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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