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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2740b2e01144a5264909f3b83eefbccf1f3ccd2c0e7492a28b065a1d067b196c' 
  AND token = 'Z5XmwPdt+OHCBspZDeEkHdUtUFXVwaTkJ1h7PMILYCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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