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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21302e4fafd53e9be2505133bf132ec3e54197625a215abd413d7af0beebc8e3' 
  AND token = 'ToFkEZ18dPm68r2dHOvf6fAuMF7dRmxXcoWn6MMRERA=' 
  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"
    }
  }
}