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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e5c9b4287d560f08213ae7e0dc79b4b1714f25d75eefc46a3d330a6c38a9d64' 
  AND token = 'injWStRmowotl8Hp4vbSt1l1GdUG0pb9h9atBaATCJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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