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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9bd12fc3ccc73cddca7ab679b78a8d7506531335c49236fb848c8220e5713e3' 
  AND token = 'vBtRr5Gq65v7Pk0mIuKXqfjMCNf82E+nsds0Vfq8LiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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