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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49717ddda49a48851083a738f1b1a88a260d3755b6077f46867e7d72f137a573' 
  AND token = '892fqXSJtr8h5KfXejE09bYD7ZJyVHNhMvgc4BMi20o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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