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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32524b5e1bfff167b485f88389a08ef83a98670c3ee9c6d1e4f87e60cd423aa4' 
  AND token = 'LPGsOzopD7eO+VWKfV7fRt+Kfrqu/xeUhDArKQf+/E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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