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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cc121207a60bf3eff04bf28a9a49a921c42d465a43dfe8c45a205ce39a0704e' 
  AND token = '0h++Clwkm6WRg48v9u1iWtNtrsjFFqws9GISx2/YPQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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