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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc2916ad0f647cac468a4679d1172f7fec491cbb24dd0a1b9376259ff154cdc5' 
  AND token = 'bC65Su55w+LYcbWY+uBObwwMbB5fbZSyM50Ooy8rGrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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