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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '536ba8389ee596af07a32e9f6e37956ec68294ae324962eba0d8ddf20f569d94' 
  AND token = 'hkFWxpfKWpOc+74UmS4xX3KmLj5luAuHeRJnUfa6R9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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