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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '179af81b9abc0ee239fd6ce0dfd8ddf5512fa9ba708ceee37b12920e2384542a' 
  AND token = 'AaE9Q8XeY6Bergs0PntI73X18MAH3dYV7JFrgE9hYJA=' 
  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"
    }
  }
}