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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46adb67a838cb45f277d3f09949e1c20ade02ff861058deac036d268c36e3858' 
  AND token = 'vYdpelix+3fioCpXnXp41z5NE+f8elGHeRfVdP2pn9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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