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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39ef9dc5bea0e0ac6c6ac95c4ad062643c9948f5733965b28fd4b627542e7d1c' 
  AND token = 'J58gmbHfX526TbNwJCQaTTDwEWNlun3je1Q0tFF0rjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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