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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a58a223b64539afc2ed8eee915a67e678c72f0a8e47f5f65178e05d5e63224c4' 
  AND token = 'J4x/0cpLiqHicr748My5PeME7hadO/s2N+9WxaN3pwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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