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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '609ef33819b46eba58d24d190b1629391c4903ab17ca902cedba69c3bddc8f72' 
  AND token = 'JwLXQMgfOl/7DU8QJ1wuNull6Ij/i4BcaTJrNOieJ/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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