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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee783edc59ae3cf28dbc76f280594fd972ee2755d174c7ce71b8c87f98a39a2' 
  AND token = 'OStXq+EK+EXLzFax8EyZrvi0wX7goWsbphyaRaY/e30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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