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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20b84668a6b4cbab2e4f15ccf82d03a4196d25824f0f5d481726094af7b61cf4' 
  AND token = 'sOeiM//kadB9MM8OZgO3cRtQIbKr8Lbdx1rpvVWL+4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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