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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78e2bc5c603d8b5bbe70f5eda5eb9a231868ffec24504882f64033a570dc81ac' 
  AND token = 'GgcpBAq5ejWEm9brLPmsJxJteaSPa70dh52e0nwdL3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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