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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b608894c659536aefbc12e3df34e2738d5e8da58b510400bfff6b3b82fbc4f5' 
  AND token = 'z6ojKYf5XQ/7cOJkhJme77UEMgHgjbT8x6oJf5v2wjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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