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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba4490eb4b88db78f739b54b6d9fb4004d722222e5eeeb24d604e1a5f088073c' 
  AND token = 'wu+UAcMMkZPq0nj9V05Pb/YQPfCQL/ygFteamJZOGeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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